Spike-tooth harrow.



No. 69I,388. Patented Jan. 2|, I902.

T. DnJONES.

SPIKE TOOTH HARROW.

(Application'flled Aug. 12, 1901.)

(No Model.)

WITNESSES; INVENTOR BY i ATTORNEYQ UNITED STATES PATENT OFFICE.

THOMAS D. JONES, OF SYRACUSE, NEW YORK.

SPIKE-TOOTH HARR-OW.

SPECIFICATION forming part of Letters Patent No. 691,388, dated. January21, 1902.

Application filed August 12, 1901. Serial No. 71,700. (No model.) 7

' T0 at whom it may concern:

Be it known that I, THOMAS D. JONES, of- Syracuse,in thecountyof-Onondaga and State of New York, have invented certain new anduseful Spike-Tooth Harrows, of which the following is a specification.

This invention has for'its object the production of a spike-tooth harrowwhich is par-.

ticularly simple in construction, economical in manufacture, and highlystrong, durable, and eflicient in use; and to this end 1t consists inthe devices and combinations hereintrated, is composed of. a pluralityof frame-- bars A of any suitable construction,which,as is obvious tothose skilled in the art, are normally fixed during the operation of thebar row. Said frame-bars are preferably of rounding cross-section, areprovided with substantially upright apertures a, and their lower partsare formed with diverging bearingfaces a,having portions thereofgenerally extended upwardly toward the front and rear sides of theframe-bars.

The spikateeth B are secured at intervals to the frame-bars A. The lowerportions of said teeth are formed with front and rear divergingsubstantially upright faces b b and their upper portions are providedwith shoulders b and attaching ends or shanks b Said shoulders I) areintegral with the main bodies of the teeth,and extend laterally,forwardly, and rearwardly beyond the underlying portions of thespike-teeth, the forward and rearward parts of the shoulders I) beingextended upwardly toward their outer edges and being decreased in widthtoward their upper portions. The shoulders b' engage and interlock withthe-bearing-faces a of the framebars A, facilitate the support of theframebars by the spike-teeth B, and reduce to a minimum the liability ofbending or breaking of the spike-teeth at the bases of their attachingends or shanks b Opposite sides of the shoulders b are of similarconstruction when the diverging bearing-faces a consist of the lowerportions of the peripheries of frame-bars of rounding cross-section; butsaid opposite sides may be of difierent form when other frame-barshaving diverging lower faces are used, as seen in Fig. 4,'in which A isa frame-bar substantially U -shaped in cross-section, and 13 is aspike-tooth having its shoulder b of a shape suitable for en gaging thelower face of the bar A The at taching ends or shanks b rise above theshoulders b in planes substantially coincident with the lengthwiseplanes of the underlying portions of the teeth B and are arranged in theapertures a. As clearly seen in Fig. 2, the upper extremities of theattaching ends or shanks b project above the frame-bars A and areprovided with nuts b adjustable lengthwise thereon toward the upperfaces of the frame-bars for securing the teeth in position. Suitablenut-locks b are interposed between the frame-bars A and the nuts 11 andare provided with arms respectively engaged with said frame-bars andnuts for preventing turning of the nuts.

Spike-teeth of the construction described are readily drop-forged orotherwise manufactured at minimum cost, are easily secured in position,are not readily broken, especially at the bases of their attaching ends,greatly facilitate the support of the barrow-frame owing to theconstruction of their integral shoulders I) and the close engagementthereof with the diverging bearing-faces a, and may be reversed at willby partly unscrewing the nuts and turning the teeth half way around.

My harrow will be readily understood upon reference to the foregoingdescription and the accompanying drawings, and it will be obvious tothose skilled in the art that more or less change may be made in theconstruction and arrangement of its parts without departing from thespirit of my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-- In a spike-tooth harrow, thecombination of red a frame-bar having diverging normally lower faces;with a spike-tooth having its upper portion provided with an attachingend passed through the frame-bar, said upper portion being also providedwith an integral shoulder extending laterally, forwardly and rearwardlybeyond the underlying portion of thespike-tooth, the forward andrearward parts of the shoulder being extended upwardly toward theirouter edges and said shoulder being engaged with and substantiallyclosely fitting the diverging normally lower faces of the fraine-bar,substantially as set forth.

.In testimony whereof I have hereunto signed my name, in the presence oftwo attesting witnesses, at Syracuse, in the county of Onondaga, in theState of New York, this 5th day of March, 1901.

THOMAS JONES.

\Vit-nesses:

W. BREWER, I D. LAVINE.

